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木麻黄(Casuarina equisetifolia Lin)青枯病是由青枯假单胞菌(Pseudomonassolanocearum E.F.Smith)侵染引起的维管束病害。感病植株可以表现明显的外表症状或全无外表症状。无症状病株田间诊断有时十分困难。使用DDS-11A型电导率仪和自行设制的不锈钢针电极测量木麻黄导电性中发现,病株的电导率高于健株,不同月份,苗木地径、高度、深度测量的结果有差异。应用木麻黄的导电特性,用数理分析法,随机抽取50个实测数据,建立木麻黄健株和病株电导率的数学模式即: (?)_1=16.992+0.869X_1+9.877X_4 (?)_1=75.492-1.797X_2-0.765X_3+17.436X_4 将实测时有关因子代入公式计算得电导率与实测电导率比较,便可对木麻黄青枯病株作出诊断。数理分析还表明,K~+离子浓度是影响木麻黄株电导率变化的主导因素,而水分、Ca~++,Mg~++离子浓度和多酚氧化酶活性的增加也有一定的相关。
Casuarina equisetifolia Lin bacterial wilt is a vascular bundle disease caused by the infection of Pseudomonas solanacearum E.F. Smith. Susceptible plants can exhibit overt appearance symptoms or no appearance symptoms. Asymptomatic disease field diagnosis is sometimes very difficult. The electrical conductivity of diseased plants was higher than that of healthy plants measured by DDS-11A conductivity meter and self-designed stainless steel needle electrodes. The results of different measurements of height, depth and depth of seedling in different months were different. Applying the electrical conductivity of Casuarina equisetifolia, 50 mathematical models were selected by mathematical analysis to establish the mathematical model of conductivity of Casuarina equisetifolia and its diseased plants: (?) _1 = 16.992 + 0.869X_1 + 9.877X_4 (?) _1 = 75.492-1.797X_2-0.765X_3 + 17.436X_4 The measured factor into the formula calculated conductivity and measured conductivity comparison, we can make a diagnosis of Casuarina bacterial wilt. Mathematical analysis also showed that K + ion concentration was the dominant factor that affected the conductivity of Casuarina equisetifolia, and there was also a certain correlation between water ion concentration, Ca ~ ++, Mg ~ + + ion concentration and polyphenol oxidase activity.